I was also experiencing this "Socket Exception" issue when debugging
(particularly when stepping through code). Identical setup and errors.

The problem seems to be related to xdebug itself. I went through the
process of building the latest dev version of xdebug directly from github
(https://github.com/derickr/xdebug - 2.3.0dev) and it seems to resolve the
problem for me.

For help in building xdebug, here are some steps and resources that helped: